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Planet Orbiting a Star

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Summary of Current Information
A. The Parent Star
B. The Exoplanet

VI. Calculating the Probability of Finding this Exoplanet

Even if a star has an orbiting planet, only in a very small percentage of cases will that planet make a transit across the disk of the star as seen from Earth's perspective.

The probability for a planet with a circular orbit is given by:

  probability (%) = (Rstar / a) * 100%
  % = (
(Press the calculate button to estimate the mass of the exoplanet.)


Press the button for a summary of your analysis.


Notes on Computing the Probability of Finding the Exoplanet

A complete derivation of the probability of finding a given exoplanet assuming a uniform random distribution of the angle that the plane of its orbit makes with respect to our line of sight to the star is gven by the formula above.

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Simulation Authors: Richard L. Bowman (Bridgewater College) and David Koch (Kepler Mission)

Maintained by: Richard L. Bowman rbowman@bridgewater.edu (2002-04; last updated: 19-Apr-04)